UPDATED: Apple release new phones annually, and I believe this pattern may now only be suited to those of a similar size to the iPhone 4. Subsequent phones, such as the iPhone 6, have very different dimensions and this is highly unlikely to fit them.
I am completely happy for you to sell any iPhone holders that you make from this pattern (as long as you are a small, independent business....no corporate giants!). While it may be helpful to print out the instructions, the iPhone holder is made from a series of rectangles and so a printer isn't necessary for printing out any pattern pieces. If you follow the instructions carefully and cut with precision, then this pattern should be challenging, but perfectly do-able, for a relatively new sewer.